<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../js/vue.js"></script>
  <style>
    #app{
        width: 600px;
        margin: 40px auto;
    }
    .outer{
        display: flex;
        margin-bottom: 20px;
    }
    .inner{
        padding: 0 10px;
        text-align: center;
        min-width: 100px;
        border-bottom: 1px solid #000;
        font-weight: bold;
        color: red;
    }
  </style>
</head>
<body>
  <div id="app">
    <div class=""outer>今天天气不错，我准备
        <div class="inner">{{activity}}</div>
    </div>
    <advice @advice="receiveAdvice"></advice>
  </div>
<br>
  <script>
    Vue.component('counter',{
        data(){
            return{
                arr:['打篮球','野炊','游泳','宅在家','复习迎考']
            }
        },
        template:'<button @click="giveAdvice">给出建议</button>',
        methods:{
            giveAdvice:function(){
                let msg=this.arr[Math.floor(Math.random() * this.arr.length)]
                this.$emit('advice',msg)
            }
        }
    })
    let vm = new Vue({
      el:"#app",
      data:{
           activity:''
       },
       methods:{
        receiveAdvice(msg){
            this.activity=msg
        }
       }
     })
   </script>
</body>
</html>